Does Static Friction Exist When Gravity is Applied?

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SUMMARY

The discussion confirms that static friction does exist when gravity is applied to an object resting on a surface. A 20lb object on perfectly level ground experiences two primary forces: gravity and the normal force from the ground. Static friction is present only when there is an attempt to move the object, as it counteracts the forces trying to initiate motion. This understanding clarifies misconceptions about the relationship between gravity and friction.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Basic knowledge of friction types: static and kinetic
  • Familiarity with normal force concepts
  • Concept of forces acting on stationary objects
NEXT STEPS
  • Research the differences between static and kinetic friction
  • Study Newton's laws of motion in detail
  • Explore real-world applications of static friction in engineering
  • Learn about the role of normal force in various friction scenarios
USEFUL FOR

Physics students, engineers, and anyone interested in understanding the principles of friction and motion in mechanics.

stampede247
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Hey guys first time posting and I have a really frustrating question. Is there static friction when the force of gravity is pulling an object straight against a surface. I believe that there is none because (i don't know if I'm wording this right) the friction is equal to the normal of the collision. Let's say you have a 20lb object on perfectly level ground. The only forces acting on the object would be gravity and the reaction force of the ground keeping the object up. Am I right about this. Looking forward to some answers. Thanks.
 
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stampede247 said:
Let's say you have a 20lb object on perfectly level ground. The only forces acting on the object would be gravity and the reaction force of the ground keeping the object up.

Yes those will be the only two forces acting. Friction is only present when there is motion between them mass and the surface.
 
Thank you so much for comfirming that. I had a really long debate with a friend about this and he refused to believe it was true. Now I know how to prove it to him. Thanks for the help.
 

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